Sphere with curved faces or sphere of spheres
Metaballs?

An Icosphere and a Metaball..




Icosphere Object Properties > 'Instancing' > set to 'Vertex'
Metaball parented to Icosphere





Icosphere (search) > 'Make Instances Real'





Metaball ..  Object menu > 'Convert To' .. mesh
An outside face selected, Ctrl L all outside selected
Ctrl I all inside selected, and deleted




The result is manifold, and printable. It can be tweaked to a reasonable degree .. eg Alt S fattened.. and/or Ctrl V > Vertex Smoothed..



You might need to poke a hole in it somewhere, and give it a Solidify modifier to make it hollow and drainable,it depends on your printing method..

EDIT: The above example, was only adjusting the radius and stiffness of the metaball instances. Thanks to @GTD.. an improvement.

For more flexibility, after making the instances real, before conversion to a mesh, in Object Mode, you can add another metaball with a larger radius in the same family. Left to right: the original family-base  metaball, 'Mball', its instances, and the new, larger metaball, 'Mball.xxx' The new metaball is not an instance of 'Mball', so can be edited independently, but is a member of the family.



After placing it at the same location as the instances, you can adjust it to fill any gaps between them, and after conversion to a mesh, the interior is clean.